| Summary: | In the title compound, [Hg(C14H13N4O3)Cl], the HgII atom is four-coordinated by one O atom and two N atoms from a tridentate 1-(2-ethoxyphenyl)-3-(4-nitrophenyl)triazenide ligand and one terminal chloride ion in a distorted square-planar geometry. In the crystal structure, the mononuclear complexes are linked into pairs through C—H...O and C—H...Cl hydrogen bonds as well as π–π and C—H...π stacking interactions. In addition, weak Hg–μ6-arene π-interactions [mean distance of 3.667 (2) Å] are present between these dimers. The π–π stacking interactions are between aromatic rings with a centroid–centroid distance of 3.884 (2) Å. Moreover, edge-to-face interactions are present between ethoxy CH groups and aromatic rings with H...π distances of 2.81 Å.
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